index.aspx 页：
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="index.aspx.cs" Inherits="index" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>ASP.NET的FTP上传和下载</title>
<script src="http://code.jquery.com/jquery-latest.js"></script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:FileUpload runat="server" ID="FileUpload"></asp:FileUpload>
<asp:Button ID="Button1" runat="server" Text="FTP上传" OnClick="Button1_Click" />
<asp:Button ID="Button2" runat="server" Text="刷新列表" OnClick="Button2_Click" />
<br />
<br />
<table border="1" width="1000">
<tr>
<th>编号</th>
<th>文件夹</th>
<th>文件名</th>
<th>日期</th>
<th>http协议下载</th>
<th>ftp协议下载</th>
</tr>
<asp:Repeater runat="server" ID="Repeater1">
<ItemTemplate>
<tr>
<td><%#Eval("fileNo") %></td>
<td><%#Eval("ftpURI") %></td>
<td><%#Eval("fileName") %></td>
<td><%#Eval("datetime") %></td>
<td><a target="_blank" href='http://djk8888csdn.3vcm.net/<%#Eval("ftpURI") %>/<%#Eval("fileName") %>'>http://djk8888csdn.3vcm.net/<%#Eval("ftpURI") %>/<%#Eval("fileName") %></a></td>
<td><input type="button" value="下载" onclick=ftpDownload('<%#Eval("ftpURI") %>','<%#Eval("fileName") %>') /></td>
</tr>
</ItemTemplate>
</asp:Repeater>
</table>
</div>
</form>
</body>
</html>
<script type="text/javascript">
function ftpDownload(uri, name) {
$.get("ftpDownload.ashx",
{ ftpURI: uri, fileName: name },
function (e) {
if (e == "ok") {
alert("下载成功！文件在：\r\n C:\\" + name);
}
else {
alert("下载失败:\r\n" + e);
}
});
}
</script>
index.aspx.cs 页：
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.UI.WebControls;
/// <summary>
/// 这是一个完整的例子
/// </summary>
public partial class index : System.Web.UI.Page
{
static string strfile = "info.txt";//txt文件名
string txtPath = HttpContext.Current.Server.MapPath(strfile);//相对路径转绝对路径
string strout = string.Empty;//txt文件里读出来的内容
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
Bind();
}
}
//刷新列表
protected void Button2_Click(object sender, EventArgs e)
{
Bind();
}
private void Bind()
{
//string txt = File.ReadAllText(txtPath, Encoding.Default);//如果txt内容较少可用此法
if (File.Exists(txtPath))
{
using (StreamReader sr = new StreamReader(System.Web.HttpContext.Current.Server.MapPath(strfile), System.Text.Encoding.Default))
{
strout = sr.ReadToEnd();
string temp = strout.Replace("\r\n", "");
string[] strArr = temp.Split(';');//分解每一组数据
if (strArr != null && strArr.Any())
{
int fileNo = 1;
List<Info> list = new List<Info>();
foreach (var item in strArr)
{
if (!string.IsNullOrEmpty(item) && !string.IsNullOrWhiteSpace(item))
{
string[] strArr2 = item.Split('|');//分解每一个属性
Info info = new Info();
info.fileNo = fileNo; fileNo++;
info.ftpURI = strArr2[0].ToString();
info.fileName = strArr2[1].ToString();
info.datetime = DateTime.Parse(strArr2[2].ToString());
list.Add(info);
}
}
if (list != null && list.Any())
{
this.Repeater1.DataSource = list.OrderByDescending(a => a.datetime);
this.Repeater1.DataBind();
}
}
}
}
}
protected void Button1_Click(object sender, EventArgs e)
{
string errorMsg = "";
if (FileUpload.HasFile)
{
int fileLength = FileUpload.PostedFile.ContentLength;//文件大小，单位byte
string fileName = Path.GetFileName(FileUpload.PostedFile.FileName);//文件名称
string extension = Path.GetExtension(FileUpload.PostedFile.FileName).ToLower();//文件扩展名
//限制上传文件最大不能超过500M
if (!(fileLength < 512 * 1024 * 1024))
{
Response.Write("<script>alert('文件最大不能超过500M！');</script>");
return;
}
//限制文件格式
if (!".doc.docx.xls.xlsx.pdf.txt.jpg.jpeg".Contains(extension))
{
Response.Write("<script>alert('不支持的文件格式！');</script>");
return;
}
//创建文件夹
string ftpURI = DateTime.Now.ToString("yyyyMMdd");//以日期作为文件夹名称
try
{
FtpWeb.CreateDirectory(ftpURI);//创建文件夹
}
catch { }
//准备上传文件
Stream fileStream = null;
try
{
fileStream = FileUpload.PostedFile.InputStream;//读取本地文件流
var b = FtpWeb.Upload(ftpURI, fileName, fileLength, fileStream, out errorMsg);//开始上传
if (b)
{
if (File.Exists(txtPath))
{
FileStream myStream = new FileStream(txtPath, FileMode.Append, FileAccess.Write);// FileMode.Append,追加一行数据
StreamWriter sw = new StreamWriter(myStream);
sw.WriteLine(ftpURI + "|" + fileName + "|" + DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss") + ";");//写入文件
sw.Close();
}
Bind();
Response.Write("<script>alert('上传成功！');</script>");
}
else
{
Response.Write("<script>alert('上传失败！" + errorMsg + "');</script>");
}
}
catch (Exception ex)
{
Response.Write("<script>alert('上传失败！" + ex.ToString() + "');</script>");
}
finally
{
if (fileStream != null) fileStream.Close();
}
}
else
{
Response.Write("<script>alert('请选择一个文件再上传！');</script>");
}
}
public class Info
{
public int fileNo { get; set; }
public string ftpURI { get; set; }
public string fileName { get; set; }
public DateTime datetime { get; set; }
}
}ftpDownload.ashx 页：
<%@ WebHandler Language="C#" Class="ftpDownload" %>
using System;
using System.Web;
public class ftpDownload : IHttpHandler
{
/// <summary>
/// ftp协议下载文件
/// </summary>
/// <param name="context"></param>
public void ProcessRequest(HttpContext context)
{
context.Response.ContentType = "text/plain";
string ftpURI = context.Request.QueryString["ftpURI"];//ftpURI
string fileName = context.Request.QueryString["fileName"];//fileName
string localPath = "C:\\";//文件下载路径(可自定义)
string errorMsg = "";
bool b = FtpWeb.Download(ftpURI, localPath, fileName, out errorMsg);
if (b)
{
context.Response.Write("ok");
}
else
{
context.Response.Write(errorMsg);
}
}
public bool IsReusable
{
get
{
return false;
}
}
}FtpWeb.cs 页：
using System;
using System.IO;
using System.Net;
/// <summary>
/// web地址： http://djk8888csdn.3vcm.net/
/// FTP地址： ftp://013.3vftp.com/
/// FTP账号： djk8888csdn
/// FTP密码： 123456
/// </summary>
public class FtpWeb
{
public static string ftpHost = "ftp://013.3vftp.com/";//FTP的ip地址或域名
public static string ftpUserID = "djk8888csdn";//ftp账号
public static string ftpPassword = "123456";//ftp密码
/// <summary>
/// 上传
/// </summary>
/// <param name="ftpURI">ftp上的路径</param>
/// <param name="filename">ftp上的文件名</param>
/// <param name="fileLength">文件大小</param>
/// <param name="localStream">本地文件流</param>
/// <param name="errorMsg">报错信息</param>
/// <returns></returns>
public static bool Upload(string ftpURI, string filename, int fileLength, Stream localStream, out string errorMsg)
{
errorMsg = "";
Stream fileStream = null;//本地文件流
Stream requestStream = null;//ftp文件流
try
{
fileStream = localStream;//本地文件流
Uri uri = new Uri(ftpHost + ftpURI + "/" + filename);//ftp完整路径
FtpWebRequest uploadRequest = (FtpWebRequest)WebRequest.Create(uri);//创建FtpWebRequest实例uploadRequest
uploadRequest.Method = WebRequestMethods.Ftp.UploadFile;//将FtpWebRequest属性设置为上传文件
uploadRequest.Credentials = new NetworkCredential(ftpUserID, ftpPassword);//认证FTP用户名密码
requestStream = uploadRequest.GetRequestStream();//ftp上的空文件
int buffLength = 2048; //开辟2KB缓存区
byte[] buff = new byte[buffLength];
int contentLen;
contentLen = fileStream.Read(buff, 0, buffLength);
while (contentLen != 0)
{
requestStream.Write(buff, 0, contentLen);//将本地文件流写入到ftp上的空文件中去
contentLen = fileStream.Read(buff, 0, buffLength);
}
requestStream.Close();
fileStream.Close();
return true;
}
catch (Exception ex)
{
errorMsg = ex.Message;
return false;
}
finally
{
if (fileStream != null) fileStream.Close();
if (requestStream != null) requestStream.Close();
}
}
//创建文件夹
public static string CreateDirectory(string ftpDir)
{
FtpWebRequest request = SetFtpConfig(WebRequestMethods.Ftp.MakeDirectory, ftpDir);
FtpWebResponse response = (FtpWebResponse)request.GetResponse();
return response.StatusDescription;
}
private static FtpWebRequest SetFtpConfig(string method, string ftpDir)
{
return SetFtpConfig(method, ftpDir, "");
}
private static FtpWebRequest SetFtpConfig(string method, string ftpDir, string fileName)
{
ftpDir = string.IsNullOrEmpty(ftpDir) ? "" : ftpDir.Trim();
return SetFtpConfig(ftpHost, ftpUserID, ftpPassword, method, ftpDir, fileName);
}
private static FtpWebRequest SetFtpConfig(string host, string username, string password, string method, string RemoteDir, string RemoteFileName)
{
System.Net.ServicePointManager.DefaultConnectionLimit = 50;
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(host + RemoteDir + "/" + RemoteFileName);
request.Method = method;
request.Credentials = new NetworkCredential(username, password);
request.UsePassive = false;
request.UseBinary = true;
request.KeepAlive = false;
return request;
}
/// <summary>
/// FTP文件下载(代码仅供参考)
/// </summary>
/// <param name="ftpURI">fpt文件路径</param>
/// <param name="localPath">本地文件路径</param>
/// <param name="fileName">ftp文件名</param>
/// <param name="errorMsg">报错信息</param>
/// <returns></returns>
public static bool Download(string ftpURI, string localPath, string fileName, out string errorMsg)
{
errorMsg = "";
FtpWebRequest reqFTP = null;
FileStream outputStream = null;
Stream ftpStream = null;
FtpWebResponse response = null;
try
{
outputStream = new FileStream(localPath + "/" + fileName, FileMode.Create);//创建本地空文件
Uri uri = new Uri(ftpHost + ftpURI + "/" + fileName);//ftp完整路径
reqFTP = (FtpWebRequest)FtpWebRequest.Create(uri);
reqFTP.Method = WebRequestMethods.Ftp.DownloadFile;
reqFTP.UseBinary = true;
reqFTP.Credentials = new NetworkCredential(ftpUserID, ftpPassword);//登录ftp
response = (FtpWebResponse)reqFTP.GetResponse();
ftpStream = response.GetResponseStream();//读取ftp上文件流
long cl = response.ContentLength;
int bufferSize = 2048;//缓冲
int readCount;
byte[] buffer = new byte[bufferSize];
readCount = ftpStream.Read(buffer, 0, bufferSize);
while (readCount > 0)
{
outputStream.Write(buffer, 0, readCount);//将ftp文件流写入到本地空文件中去
readCount = ftpStream.Read(buffer, 0, bufferSize);
}
return true;
}
catch (Exception ex)
{
errorMsg = ex.Message;
return false;
}
finally
{
if (ftpStream != null) ftpStream.Close();
if (outputStream != null) outputStream.Close();
if (response != null) response.Close();
}
}
}winform的ftp上传下载：https://blog.csdn.net/djk8888/article/details/80662238